some time, sometime, some times

________ I like to be alone.
(A) Some time
(B) Some times
(C) Sometime
(D) Sometimes
今天早上做到这个题目的时候，发现对这几个选项的含义有些模糊，所以查证后在此做下记录。
1、some time 和 sometime
some time ：一些时间（这个最简单，就是字面意思）
I need some time to finish my homework.
When he finds there is still quite some time to go before the train arrives, he wants to take a short sleep.

sometime : 曾经或将来的某个时间（两者结合，就像是把time限定住了）
Those materials are wonderful, I will study them sometime! (放收藏夹吃灰去吧 :p)
He was sometime basketball player at the university.
We must get together sometime.
I saw him sometime last summer.

2、some times 和 sometimes
some times ： 几次，一些次数（简单，字面意思）
I called you some times yesterday, but there was no reply.
He came to see me some times, when he lived nearby.

sometimes: 有时，时而（过去发生了几次，形成了规律？）
Sometimes we go hiking in the mountains.
She's a lovely child, but she can be a bit of a handful sometimes.
But sometimes lonely is a good for you, it helps you to think, to watch the world, to do your own things.